diff --git a/dev-libs/urdfdom/urdfdom-1.0.0.ebuild b/dev-libs/urdfdom/urdfdom-1.0.0.ebuild
index 439b11f153e40..7bac4aa9496af 100644
--- a/dev-libs/urdfdom/urdfdom-1.0.0.ebuild
+++ b/dev-libs/urdfdom/urdfdom-1.0.0.ebuild
@@ -23,7 +23,7 @@ fi
 DESCRIPTION="URDF (U-Robot Description Format) library"
 HOMEPAGE="http://ros.org/wiki/urdf"
 LICENSE="BSD"
-SLOT="0"
+SLOT="0/1"
 IUSE=""
 
 RDEPEND=">=dev-libs/urdfdom_headers-1.0.0
diff --git a/dev-libs/urdfdom/urdfdom-9999.ebuild b/dev-libs/urdfdom/urdfdom-9999.ebuild
index 439b11f153e40..7bac4aa9496af 100644
--- a/dev-libs/urdfdom/urdfdom-9999.ebuild
+++ b/dev-libs/urdfdom/urdfdom-9999.ebuild
@@ -23,7 +23,7 @@ fi
 DESCRIPTION="URDF (U-Robot Description Format) library"
 HOMEPAGE="http://ros.org/wiki/urdf"
 LICENSE="BSD"
-SLOT="0"
+SLOT="0/1"
 IUSE=""
 
 RDEPEND=">=dev-libs/urdfdom_headers-1.0.0